Acoustic schwannoma

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contributed by Dr Frank Gaillard on May 2, 2008

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  • account for 75-90% of cerebellopontine angle masses.
  • Most vestibular schwannomas have an intracanalicular component ("trumpet IAM sign"), however 20% are extracanalicular.
  • 85% vestibular portion of 8th nerve
  • Significant signal heterogeneity with cystic or haemorrhagic areas is more typical of vestibular schwannoma than meningioma.
  • Bilateral vestibular schwannomas are diagnostic of NF2

Imaging differential diagnosis

  • MRI: T2WI . Case Epidermoid05

    T2WI

  • CT: CT C+ . Case Acoustic Schwannoma

    Case 1

  • Vestibular Schwannoma . Imageset Vestibular Schwannoma

    Case 2

  • MRI: T1WI with gad . Case Acoustic Schwannoma

    Case 3

  • MRI: FIESTA . Case Intracanalicular Acoustic Schwannoma

    Case 4

  • MRI: Coronal T1 with contrast . Case Acoustic Neuroma

    Case 5

  • MRI: Coronal T1 C+ . Case Small acoustic schwannoma

    Coronal T1 C+

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